/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2007 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
 *                         University of Stuttgart.  All rights reserved.
 * Copyright (c) 2004-2005 The Regents of the University of California.
 *                         All rights reserved.
 * Copyright (c) 2006-2007 Sun Microsystems, Inc.  All rights reserved.
 * Copyright (c) 2008-2013 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2015-2017 Research Organization for Information Science
 *                         and Technology (RIST). All rights reserved.
 * Copyright (c) 2016-2018 Los Alamos National Security, LLC. All rights
 *                         reserved.
 * Copyright (c) 2020      Google, LLC. All rights reserved.
 * $COPYRIGHT$
 *
 * Additional copyrights may follow
 *
 * $HEADER$
 */


#include "opal_config.h"
#include <stdio.h>

#include "opal/mca/mca.h"
#include "opal/util/output.h"
#include "opal/mca/base/base.h"
#include "opal/mca/base/mca_base_alias.h"
#include "opal/mca/btl/btl.h"
#include "opal/mca/btl/base/base.h"

mca_base_var_enum_flag_t *mca_btl_base_flag_enum = NULL;
mca_base_var_enum_flag_t *mca_btl_base_atomic_enum = NULL;

mca_base_var_enum_value_flag_t mca_btl_base_flag_enum_flags[] = {
    {MCA_BTL_FLAGS_SEND, "send", 0},
    {MCA_BTL_FLAGS_PUT, "put", 0},
    {MCA_BTL_FLAGS_GET, "get", 0},
    {MCA_BTL_FLAGS_SEND_INPLACE, "inplace", 0},
    {MCA_BTL_FLAGS_SIGNALED, "signaled", 0},
    {MCA_BTL_FLAGS_ATOMIC_OPS, "atomics", 0},
    {MCA_BTL_FLAGS_ATOMIC_FOPS, "fetching-atomics", 0},
    {MCA_BTL_FLAGS_SINGLE_ADD_PROCS, "static", 0},
    {MCA_BTL_FLAGS_CUDA_PUT, "cuda-put", 0},
    {MCA_BTL_FLAGS_CUDA_GET, "cuda-get", 0},
    {MCA_BTL_FLAGS_CUDA_COPY_ASYNC_SEND, "cuda-async-send", 0},
    {MCA_BTL_FLAGS_CUDA_COPY_ASYNC_RECV, "cuda-async-recv", 0},
    {MCA_BTL_FLAGS_FAILOVER_SUPPORT, "failover", 0},
    {MCA_BTL_FLAGS_NEED_ACK, "need-ack", 0},
    {MCA_BTL_FLAGS_NEED_CSUM, "need-csum", 0},
    {MCA_BTL_FLAGS_HETEROGENEOUS_RDMA, "hetero-rdma", 0},
    {MCA_BTL_FLAGS_RDMA_FLUSH, "rdma-flush", 0},
    {0, NULL, 0}
};

mca_base_var_enum_value_flag_t mca_btl_base_atomic_enum_flags[] = {
  {MCA_BTL_ATOMIC_SUPPORTS_ADD, "add", 0},
  {MCA_BTL_ATOMIC_SUPPORTS_AND, "and", 0},
  {MCA_BTL_ATOMIC_SUPPORTS_OR, "or", 0},
  {MCA_BTL_ATOMIC_SUPPORTS_XOR, "xor", 0},
  {MCA_BTL_ATOMIC_SUPPORTS_LAND, "land", 0},
  {MCA_BTL_ATOMIC_SUPPORTS_LOR, "lor", 0},
  {MCA_BTL_ATOMIC_SUPPORTS_LXOR, "lxor", 0},
  {MCA_BTL_ATOMIC_SUPPORTS_SWAP, "swap", 0},
  {MCA_BTL_ATOMIC_SUPPORTS_MIN, "min", 0},
  {MCA_BTL_ATOMIC_SUPPORTS_MAX, "max", 0},
  {MCA_BTL_ATOMIC_SUPPORTS_CSWAP, "compare-and-swap", 0},
  {MCA_BTL_ATOMIC_SUPPORTS_GLOB, "global"},
  {0, NULL, 0}
};

mca_btl_active_message_callback_t mca_btl_base_active_message_trigger[MCA_BTL_TAG_MAX] = {{0}};

/*
 *  mca_btl_base_descriptor_t
 */

static void mca_btl_base_descriptor_constructor(mca_btl_base_descriptor_t* des)
{
    des->des_segments = NULL;
    des->des_segment_count = 0;
    des->des_cbfunc = NULL;
    des->des_cbdata = NULL;
    des->des_flags = 0;
}

static void mca_btl_base_descriptor_destructor(mca_btl_base_descriptor_t* des)
{
}

OBJ_CLASS_INSTANCE(
    mca_btl_base_descriptor_t,
    opal_list_item_t,
    mca_btl_base_descriptor_constructor,
    mca_btl_base_descriptor_destructor);


/*
 * The following file was created by configure.  It contains extern
 * statements and the definition of an array of pointers to each
 * component's public mca_base_component_t struct.
 */

#include "opal/mca/btl/base/static-components.h"
#include "btl_base_error.h"

/*
 * Global variables
 */
char* mca_btl_base_include = NULL;
char* mca_btl_base_exclude = NULL;
int mca_btl_base_warn_component_unused = 1;
opal_list_t mca_btl_base_modules_initialized = {{0}};
bool mca_btl_base_thread_multiple_override = false;

static int mca_btl_base_register(mca_base_register_flag_t flags)
{
    /* Override the per-BTL "don't run if THREAD_MULTIPLE selected"
       embargo? */
    mca_btl_base_thread_multiple_override = false;
    (void) mca_base_var_register("opal", "btl", "base", "thread_multiple_override",
                                 "Enable BTLs that are not normally enabled when MPI_THREAD_MULTIPLE is enabled (THIS IS FOR DEVELOPERS ONLY!  SHOULD NOT BE USED BY END USERS!)",
                                 MCA_BASE_VAR_TYPE_BOOL, NULL, 0,
                                 MCA_BASE_VAR_FLAG_INTERNAL,
                                 OPAL_INFO_LVL_9,
                                 MCA_BASE_VAR_SCOPE_READONLY,
                                 &mca_btl_base_thread_multiple_override);

    (void) mca_base_var_register("opal", "btl", "base", "include", NULL,
                                 MCA_BASE_VAR_TYPE_STRING, NULL, 0, 0,
                                 OPAL_INFO_LVL_9,
                                 MCA_BASE_VAR_SCOPE_READONLY,
                                 &mca_btl_base_include);
    (void) mca_base_var_register("opal", "btl", "base", "exclude", NULL,
                                 MCA_BASE_VAR_TYPE_STRING, NULL, 0, 0,
                                 OPAL_INFO_LVL_9,
                                 MCA_BASE_VAR_SCOPE_READONLY,
                                 &mca_btl_base_exclude);
    (void) mca_base_var_register("opal", "btl", "base", "warn_component_unused",
                                 "This parameter is used to turn on warning messages when certain NICs are not used",
                                 MCA_BASE_VAR_TYPE_INT, NULL, 0, 0,
                                 OPAL_INFO_LVL_9,
                                 MCA_BASE_VAR_SCOPE_READONLY,
                                 &mca_btl_base_warn_component_unused);

    (void) mca_base_var_enum_create_flag ("btl_flags", mca_btl_base_flag_enum_flags, &mca_btl_base_flag_enum);
    (void) mca_base_var_enum_register("opal", "btl", "base", "btl_flags",
                                 &mca_btl_base_flag_enum);
    (void) mca_base_var_enum_create_flag ("btl_atomic_flags", mca_btl_base_atomic_enum_flags, &mca_btl_base_atomic_enum);
    (void) mca_base_var_enum_register("opal", "btl", "base", "btl_atomic_flags",
                                 &mca_btl_base_atomic_enum);

    /* Note that we break abstraction rules here by listing two
       specific BTLs here in the base.  This is necessary, however,
       due to extraordinary circumstances:

       1. In Open MPI v5.0.0, we want to rename the "vader" BTL to be
          "sm", because the "old" sm BTL is long gone, and the "vader"
          name is not very user-friendly.

       2. The MCA aliasing mechanism was therefore created for v5.0.0.
          Both the component itself and all of its MCA vars are
          aliased.

       3. However -- at least as currently implemented -- by the time
          individual components are registered, it's too late to make
          aliases.  Hence, if we want to preserve the name "vader" for
          some sembalance of backwards compatibility (and we do!), we
          have to register "vader" as an "alias for "sm" up here in
          the BTL base, before any BTL components are registered.

       This is why we tolerate this abstraction break up here in the
       BTL component base. */
    (void) mca_base_alias_register ("opal", "btl", "sm", "vader", MCA_BASE_ALIAS_FLAG_NONE);

    return OPAL_SUCCESS;
}

/**
 * Function for finding and opening either all MCA components, or the one
 * that was specifically requested via a MCA parameter.
 */
static int mca_btl_base_open(mca_base_open_flag_t flags)
{
    int ret;

    /* Open up all available components */

    if (OPAL_SUCCESS !=
        (ret = mca_base_framework_components_open(&opal_btl_base_framework, flags))) {
        return ret;
    }

  /* Initialize the list so that in mca_btl_base_close(), we can
     iterate over it (even if it's empty, as in the case of
     opal_info) */

  OBJ_CONSTRUCT(&mca_btl_base_modules_initialized, opal_list_t);

  /* get the verbosity so that BTL_VERBOSE will work */
  mca_btl_base_verbose = opal_output_get_verbosity(opal_btl_base_framework.framework_output);

  /* All done */
  return OPAL_SUCCESS;
}

static int mca_btl_base_close(void)
{
    mca_btl_base_selected_module_t *sm, *next;

#if 0
    /* disable event processing while cleaning up btls */
    opal_event_disable();
#endif
    /* Finalize all the btl components and free their list items */

    OPAL_LIST_FOREACH_SAFE(sm, next, &mca_btl_base_modules_initialized, mca_btl_base_selected_module_t) {
        /* Blatently ignore the return code (what would we do to recover,
           anyway?  This component is going away, so errors don't matter
           anymore) */

        sm->btl_module->btl_finalize(sm->btl_module);
        opal_list_remove_item(&mca_btl_base_modules_initialized, &sm->super);
        free(sm);
    }

    (void) mca_base_framework_components_close(&opal_btl_base_framework, NULL);

    OBJ_DESTRUCT(&mca_btl_base_modules_initialized);

#if 0
    /* restore event processing */
    opal_event_enable();
#endif
    /* All done */
    return OPAL_SUCCESS;
}

MCA_BASE_FRAMEWORK_DECLARE(opal, btl, "Byte Transport Layer", mca_btl_base_register,
                           mca_btl_base_open, mca_btl_base_close, mca_btl_base_static_components,
                           0);
